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573 api jobs at 298 companies in Westminster, CO

6d
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API Developer
Pittsburgh or Cleveland or Dallas or Birmingham or Phoenix or Denver
OnsiteFull Time
CGI
CGINYSE: GIB: Provides information technology and business consulting services.
8+ YOE8+ years Java/J2EE experience building RESTful APIs using Spring Boot and microservices; experience with DevOps, Kafka, IBM MQ, SQL/NoSQL and cloud platforms required.
Java, J2EE, Spring Boot, Microservices, REST API, Angular, XML, JSON, Swagger, Jenkins, uDeploy, GIT, Kafka, IBM MQ, SQL, No Sql, AWS, Azure, GitHub, CI/CD, React, JavaScript, HTML, CSS, JSON Web Token (JWT), UML, XPath
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1mo
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API Integrations Developer
Denver, Colorado, United States
$119k-$133k/yr HybridFull Time
Colorado Access
Colorado Access: Provides managed care and health insurance for Medicaid members.
4+ YOEBachelor's in CS or related required; 4+ years backend experience (Python, Node.js, Java, or .NET); HL7 FHIR and X12 EDI experience; strong REST API, security (OAuth2, JWT, mTLS), SQL, and HIPAA knowledge; experience with cloud and CI/CD.
Python, Flask, FastAPI, Django, Node.js, Java, .NET, OpenAPI/Swagger, Postman, X12 EDI, HL7 FHIR, HL7 v2, CDA, EHRs, Docker, Kubernetes, GitHub Actions, Azure DevOps, Jenkins, ELK, Datadog, Prometheus, Grafana, AWS, Azure, GCP, SQL Server, Snowflake, Data Vault 2.0, pytest, JUnit, Pact, k6, Locust, OAuth2, JWT, mTLS, RBAC/ABAC, Microsoft Word, Microsoft Excel, Microsoft PowerPoint, Microsoft Outlook, Microsoft SharePoint
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1mo
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Senior Software Engineer (Hogan API)
Hopkins or Atlanta or Chicago or Charlotte or Englewood or Brookfield or Irving
$120k-$141k/yr HybridFull Time
U.S. Bank
U.S. BankNYSE: USB: Provider of personal, business, and institutional financial services.
5+ YOEBachelor's degree or equivalent and 5+ years relevant experience. Experience with mainframe/Hogan development (COBOL, JCL, CICS), APIs, system design, testing, security, and cross-team collaboration; Scrum familiarity.
Hogan COBOL, JCL, CICS, JSON, Splunk, IMS Database, GitLab, IDz/RDz (IBM Developer for zOS), Jira
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4d
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Software Engineer Lead - Full Stack Java, API
Pittsburgh or Denver or Farmers Branch
$86k-$158k/yr OnsiteFull Time
PNC Financial Services
PNC Financial ServicesNYSE: PNC: Provides banking, lending, and investment services to customers.
3+ YOERequires 3+ years developing enterprise Java applications, Spring and microservices experience, API/REST development, JavaScript/Angular front-end work, Oracle familiarity, and leadership/mentoring skills.
Java, JavaScript, Spring, Microservices, RESTful APIs, Angular, Oracle, Agile
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1mo
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Senior Software Engineer – API & Cloud Integrations (Java, AWS)
Denver or Cedar Rapids or Philadelphia
$94k-$120k/yr HybridFull Time
Transamerica
TransamericaNYSE: AEG: Provides insurance, retirement solutions, and investment products to customers.
3+ YOEBachelor’s or equivalent experience; 3+ years Core Java; experience with Spring, microservices, APIs, databases (RDBMS/NoSQL), cloud (AWS/Azure), CI/CD, and integration frameworks; strong analytical and communication skills.
Java, Core Java, Spring Framework, Spring Boot, Spring MVC, J2EE, Entity Framework, IIS, Swagger, Swagger API, OData, .NET API 2, .NET API Core, AutoMapper, MS Cosmos DB, Microsoft Cosmos DB, Apache Cassandra, Amazon DynamoDB, AWS, Azure, EC2, ECS, S3, Kinesis, Microsoft VMs, Microsoft Blob, Microsoft Data Factory, Microsoft SQL Data Warehouse, Microsoft ARM Templates, Microsoft Event Hubs, Visual Studio, Git, Bitbucket, Maven, Jenkins, Nexus, SQL Management Studio, NUnit, Ajax, MS HPC, SageMaker, Spark, API Gateways, Apache Camel, Zookeeper, Kafka, Docker, OpenShift, Kubernetes, Angular, React, Vue.js, ASP.NET MVC, HTML, JS, CSS
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2w
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Engineering Manager - Content API (f/m/d)
Dublin or London or Berlin or Denver or San Francisco or New York City
RemoteFull Time
Contentful
Contentful: SaaS platform for headless content management and delivery.
5+ YOE5+ Mgmt5+ years leading development teams; proficiency in TypeScript, JavaScript, React, Node.js; experience with headless CMS (preferably Contentful); strong mentoring, stakeholder collaboration, and scalability experience.
TypeScript, JavaScript, React, Node.js, Contentful, PostgreSQL
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3mo
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Partner Solutions Architect
Denver or Appleton
$120k-$140k/yr HybridFull Time
Render Networks
Render Networks: SaaS platform for digitizing telecom and energy infrastructure construction.
5+ YOETechnical bachelor’s degree and 5+ years in software/API integration, cloud, or systems engineering; strong API/middleware experience; programming skills; GIS/geospatial knowledge; architecture and prototyping experience.
Python, JavaScript, Go, DotNet, Java, GIS, APIs
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1mo
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Workday Extend Lead - Senior Manager
Chicago or Denver or Boston or Denver or Washington or Pensacola or Boston or New York City or Washington or Pensacola or United States
$165k-$190k/yr RemoteFull Time
Huron
HuronNasdaq: HURN: Professional services firm providing management consulting and digital transformation.
5+ YOE5+ years Workday experience including Workday Extend development; experience across HCM, Finance, Integrations, Reporting; Workday integrations (Studio, EIB, APIs); APIs/JSON and event-driven architectures; strong client-facing and communication skills.
Workday Extend, Workday, Studio, EIB, APIs, JSON
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1mo
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Senior Platform Engineer, AI
Denver or Long Beach
$170k-$275k/yr HybridFull Time
True Anomaly
True Anomaly: Develops autonomous spacecraft and software for space security missions.
5+ YOE5+ years software/cloud/DevOps experience; production development in Python/TypeScript/Java; experience with LLM APIs, prompt engineering, RAG, agent frameworks, API integrations; ability to obtain Top-Secret clearance and U.S. citizenship or equivalent status.
Python, TypeScript, Java, CrewAI, Pydantic AI, API, webhooks, MCP, Retrieval-Augmented Generation (RAG), AWS, Azure, GCP, AWS GovCloud, Azure Government, FedRAMP, NIST 800-53, IL4, IL5
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1mo
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Performance Solutions Partner II
San Francisco or Santa Cruz or San Diego or Los Angeles or Chicago or New York City or Seattle or Washington or Atlanta or Dallas or Fort Worth or Houston or Denver or Charlotte or Portland or Miami or Fort Lauderdale or San Francisco or New Jersey or Connecticut or United States or Canada
$82k-$169k/yr RemoteFull Time
Pinterest
PinterestNYSE: PINS: Visual discovery engine for finding inspiration and creative ideas.
3+ YOE3+ years client-facing experience in digital advertising/ad tech/ad ops, experience with tagging/tracking QA, HTML/CSS/JavaScript, API implementation (eg. Conversion API), strong communication, analytical problem solving, and sales-facing experience.
HTML, CSS, JavaScript, API, Conversion API
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1mo
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Senior C#/.Net Developer
Lone Tree, Colorado, United States
$150k-$170k/yr OnsiteFull Time
Charles Schwab
Charles SchwabNYSE: SCHW: Financial services, brokerage, and investment management provider.
7+ YOE7+ years in software development with .NET, C#, DDD, REST APIs, SQL Server, CI/CD, and leadership.
.NET, C#, ASP.NET, REST API, SQL Server, GitHub, CI/CD, IIS, Windows Services, DDD, SOLID, Unit Testing, Integration Testing
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2mo
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Technical Product Manager - Platform
Boulder, Colorado, United States
$180k-$205k/yr OnsiteFull Time
SumUp
SumUp: Provides mobile point-of-sale payment solutions for small businesses
Experience with Salesforce, integrating multiple internal systems, APIs, data pipelines, SQL; cross-functional leadership; agile product delivery.
Salesforce, Billing systems, Data warehouses, APIs, SQL
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3mo
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Staff SW Engineer, AI Solutions
Denver, Colorado, United States
$124k-$199k/yr HybridFull Time
Visa
VisaNYSE: V: Global payment technology facilitating electronic funds transfers.
5+ YOE5+ years software/AI experience; strong ServiceNow, API, and GenAI expertise; bachelor’s degree or equivalent with advanced degrees preferred.
ServiceNow, MCP tooling, APIs, OpenAI, Google Gemini, REST, GraphQL, JavaScript, Python, JSON, AJAX, CSS, HTML
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2d
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IT Automation Engineer
Littleton, Colorado, United States
$80k-$135k/yr OnsiteFull Time
McDonald Automotive Group
McDonald Automotive Group: Sells and services new and pre-owned vehicles in Colorado.
Experience designing and supporting automations, integrations, SQL/ETL, Power Platform and BI reporting; strong scripting, API and troubleshooting skills.
Azure SQL, Azure Data Factory, Azure Storage, Dataverse, Power BI, Power Apps, Microsoft 365, Microsoft Copilot, Power Automate, Power Platform, SQL, Python, VBA, APIs, JSON
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4d
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Project Manager - AI
Northglenn, Colorado, United States
$70k-$75k/yr OnsiteFull Time
Ramos Law
Ramos Law: Personal injury law firm with specialized medical-legal expertise.
Proven project management experience, experience with AI tools/APIs/automation and agent development, strong business acumen and communication skills.
APIs
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3mo
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IT Specialist (APPSW) - .NET - DHA
Denver or Urbana or Woodlawn or Durham or Wilkes Barre
$91k-$140k/yr OnsiteFull Time
Social Security Administration
Social Security Administration: Administers federal social insurance and financial assistance programs.
1+ YOEIT specialist with .NET/.NET Core experience, REST APIs, SQL Server, and frontend skills; familiarity with AI tools and security controls preferred.
C#, NET Core, NET Framework, Entity Framework, MVC, JavaScript, AJAX, jQuery, Bootstrap, HTML, CSS, SQL Server, Visual Studio, Azure DevOps, Git, JSON, REST API
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6d
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Senior Software Engineer
Chicago or Peoria or Westminster or Irving or Cary
$113k-$183k/yr OnsiteFull Time
Caterpillar
CaterpillarNYSE: CAT: Manufactures construction equipment, mining machinery, and industrial engines.
Hands-on software engineering with modern cloud-native patterns, APIs, AI-enabled capabilities, and ability to prototype and deliver production-ready solutions.
generative AI, LLMs, RAG, prompt engineering, AI-assisted development, automation, cloud-native services, APIs, microservices, vector databases, DevOps, observability tools
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1mo
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Senior Backend Engineer - Offroad
Missoula or Bozeman or Austin or Denver or Portland or Salt Lake City or Seattle
$146k-$182k/yr RemoteFull Time
onXmaps
onXmaps: Digital mapping and navigation apps for outdoor recreation.
7+ YOE7+ years in software development; distributed cloud APIs; Go; Vue; Docker/Kubernetes; Terraform; remote collaboration; travel for quarterly visits.
Go, Vue, Docker, Kubernetes, Terraform, API Development
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3mo
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Software Engineer - Web Developer (TS Clearance CI Poly Eligible)
Littleton, Colorado, United States
OnsiteFull Time
North Point Technology
North Point Technology: Technology services and engineering for federal government missions.
Frontend web development, JavaScript, RESTful APIs, Agile, Git, 508 compliance, rapid learning, open-source, full-stack templates.
HTML, CSS, LESS, SASS, Bootstrap, JavaScript, jQuery, Backbone.js, Ember.js, D3, REST API, Git, GitHub, Rails, Express, Django, Kubernetes, Docker, Puppet, Jenkins
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1mo
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Sales Solutions Consultant
Atlanta or Denver or Cincinnati or Salt Lake City
$100k-$148k/yr HybridFull Time
Worldpay
Worldpay: Global payment processing and merchant technology solutions for businesses.
Pre-sales solution design and scoping for merchant payment products; strong presentation, communication, problem-solving, and technical aptitude; knowledge of payments, integrations, and APIs.
APIs, Worldpay merchant platforms
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